Light emitting display device and method for driving same

Abstract

The present disclosure relates to a display device and a method for driving the same which can improve color unevenness in a low-grayscale (low-luminance) area and improve color accuracy and grayscale expression, and an image processor of a display device according to an embodiment identifies a low-grayscale area less than a threshold value according to an input maximum luminance and applies a grayscale reproduction mask thereto to reproduce a luminance of the low-grayscale area as a combination of the threshold value and a minimum value.

The invention claimed is: 
     
       1. A light emitting display device, comprising:
 a panel including a plurality of subpixels having light emitting elements, 
 wherein if the panel displays a low-grayscale less than a threshold value of each color in at least one area, the at least one area includes at least one subpixel representing grayscale 0 value, 
 wherein the at least one subpixel representing grayscale 0 value in the at least one area receives an image data with grayscale value greater than grayscale 0 value, and 
 wherein a position of the at least one subpixel representing grayscale 0 value is varied based on a cumulative usage of each light emitting element and the threshold value. 
 
     
     
       2. The light emitting display device of  claim 1 , wherein the position of the at least one subpixel representing grayscale 0 value is varied based on a lapse of driving time of the panel. 
     
     
       3. The light emitting display device of  claim 2 , wherein the position of the at least one subpixel representing grayscale 0 value is varied with a lapse of driving time of the panel even in a case of the same image data less than the threshold value. 
     
     
       4. The light emitting display device of  claim 1 , wherein the at least one subpixel representing grayscale 0 value is a non-driven subpixel. 
     
     
       5. A method of reducing luminance deviation in a low-grayscale area to improve color unevenness when driving a display comprising:
 during a first time period, driving a first set of subpixels in an area with a data signal for each respective subpixel having low grayscale value below a selected threshold and not driving a second set of subpixels within the area causing them to have a grayscale 0 value; 
 during a second time period, not driving the first set of subpixels within the area causing them to have a grayscale 0 value and driving the second set of subpixels within the area with a data signal for each respective subpixel having low grayscale value below the selected threshold value, 
 wherein a position of a set of subpixels representing grayscale 0 value is varied based on a cumulative usage of each light emitting element and the threshold value. 
 
     
     
       6. A light emitting display device, comprising:
 a panel including a plurality of subpixels having light emitting elements; and 
 a processor coupled to the panel, the processor, in operation:
 determines that the at least one area includes at least one subpixel representing grayscale 0 value based on the panel displaying a low-grayscale less than a threshold value of each color in at least one area; and 
 causes the at least one subpixel representing grayscale 0 value in the at least one area to receive an image data with grayscale value greater than grayscale 0 value, 
 
 wherein a position of the at least one subpixel representing grayscale 0 value is varied based on a cumulative usage of each light emitting element and the threshold value.